Question about 2003 Ford F150 Regular Cab

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Heater/ac flap on 2003 f 150 won't move---stays on defrost all time

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MOST LIKELY A VACUUM PROBLEM .. UNDER THE HOOD NEAR THE A/C RECIEVER DRYER LOCATE THE VACUUM HOSE THAT GOES INSIDE THE CAB . CHECK FOR VACUUM ON IT WITH ENGINE RUNNING. IF NO VACUUM CK THE ENGINE VACUUM HOSE HARNESS BACK TO THE ENGINE AND TO THE VACUUM RESERVOIR. . CORRECT ANY ENGINE VACUUM LEAKS FIRST. THEN CK INSIDE ON PASSENGER SIDE LOWER DASH FOR VACUUM HOSE CONNECTOR CONNECTION THERE SHOULD BE VACUUM ON BLACK HOSE .

Posted on Aug 06, 2010

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1 Answer

1991 dodge dakota heater vacuum air flow shutters son't move


Taking your heating box apart may be a really big job.
It would be good to check the vacuum supply at the heater box, and/or at the controls.
Lack of sufficient vacuum can cause the heater to not work.
The low vacuum could be due to a vacuum leak somewhere before it gets to the controls or the heater box.
Then, the heater box or flaps could be stuck or warped, causing malfunction.
It is all repairable, but can cost you a lot of time and effort fixing this.
God bless your efforts.

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I'm getting an intermittent loud flapping sound when the AC is turned on my 2009 Smart ForTwo


Question. Is the flapping at a very fast pace that would indicate the speed of a fan blade hitting something? If so, you may be on to something there such as a misplaced gasket or something has dropped/fallen into the blower box via a vent.

If it is not that speed then see the following..

Hope I can give you some direction. Speaking from a generic sense all ac/heaters these days have a door or doors in the blower box that control air flow from the main part of the box to different positions when you ask for vent, heater, mix, defrost etc..

Most these days are operated with a small electric servo/motor and unfortunately the mostly have plastic gears that wear and can "thump-thump" as the motor cycles trying to open or close the flapper door.

Try to change the air direction from Max AC to regular ac to heater, defroster, bi-level etc all with the AC switch in the on position if you have a separate on/off switch.

Listen to the sound and see if it comes and goes with a different location of the selector switch.

One last question. Does it happen at idle or driving down the road at any particular speed?

Lets start with that and see what happens. This is interesting.

Good luck!

May 28, 2014 | 2008 Smart fortwo

1 Answer

AC will not blow out of the dash vents, only the defroster vents or heater vents. Can I access the vent door underneath the dash?vents


Under neath the venting system behind console there is a venting housing that can be removed. Likely the air flow directional vent flap is stuck or the motor that moves the vent is faulty.

Jun 06, 2012 | 1991 Chevrolet Silverado 2500

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I turn on heater and it sounds plugged when on front defrost? When I turn it to the feet it seems to work fine. Does not defrost front window while set that way. Where can I look. It is a 2009 Saturn...


There is internal vent flaps in the venting system to direct the air flow. The flaps can get stuck in one position. Sometimes the little motors that move the flaps can go bad. I would try to manually move the vent flaps. Pain to get to though as you have to pull some venting apart to access it.

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My heater will only blow out of the dash vents and won't move to floor or defrosters. Many have said to change the vacuum hoses. Can anybody tell me where to find them? Do I need to take apart the dash?


Heater flap works on vacum lines. My jimmy had same problem. Found out flap broke inside heater core. Gmc had a default. If something breaks it goes to defrost as safety precaution. Or a vacum leak in a hose to heater.

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1 Answer

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sounds like vent flap valve wire has come off (under dash beried in plastic cowling.....

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1 Answer

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Mar 10, 2009 | 1997 Ford Windstar

1 Answer

No heat - ac stays on blowing through defrost vents


If you have the heater directed to the windshield, the AC will turn on. Move the control away from defrost.

Feb 01, 2009 | 1998 Ford Windstar

2 Answers

Very little heat from heater


the selector flap is not moving all the way to cold or hot position. Under the dashboard on the passenger side is a heat/ac box where all the duct work for the vents originates from. inside that box is the radiator for the heater and the cooling coil for the ac. the selector flap between them is stuck or not moving all the way.

Dec 29, 2008 | 1999 Ford Taurus

1 Answer

2004 Pontiac Montana blows cold air in defrost


There is a mix damper inside your duct that controls the heat over heater core and ac evaporator that to your floor and one to your defrost. it is probable an electric actuator, that is not functioning properly. If yu can locate it and manually move it, you might have to remove the actuator motor first, you should be able to figure out your problem, I hope this helps! merry Christmas!

Dec 22, 2008 | 2004 Pontiac Montana

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